Jeopardy Cell Membrane Chapter 5 Jordyn Gardner

1. JeopardyCell MembraneChapter 5Jordyn Gardner

3. What is the Structural basis of cell membranes? Lipid bilayer

4. By this model, a cell membrane has a mixed composition of phospholipids, glycolipids, sterols, and proteins. What is it? Fluid Mosaic Model

5. A cell membrane includes ___ layers composed mainly of ________& _________. 2, lipids, and phospholipids

6. True or False: Many different proteins having different functions are embedded in the membrane or positioned at its surfaces? True

7. What makes up a phospholipid ? A phosphate-containing head and two fatty acid tails attached to a glycerol backbone.

8. What does the cell membrane do? -Serves as a boundary between the outside environment and the inside of the cell -gives form and shape to cells • Can connect on cell to two or more adjacent cells • -helps vesicles form • (other answers may be acceptable)

9. What helps cells of the same type locate, stick together, and remain in the same proper tissues? Adhesion proteins

10. These from channels that match up across the plasma membranes of two cells; they let signals and substances flow rapidly between their cytoplasm Communication Proteins

11. These bind extracellular substances, such a s hormones, that trigger changes in cell activities Receptor Proteins

12. Like molecular fingerprints, they identify each cell as belonging to a particular tissue or individual. Recognition Proteins

13. These passively let solutes cross the membrane through their interior or they actively pump them through. Transport Proteins

14. The name for the net movement of like molecules or ions down a concentration gradient. Diffusion

15. What does it mean when its molecular structure lets some substances but no others cross it in certain ways, at certain times? It has selective permeability

16. Does diffusion go up or down a concentration gradient? Down

17. Is a concentration gradient a form of energy? Yes

18. What factors influence the rates of movement down a concentration gradient? The gradient’s steepness, molecular size, temperature, and electric or pressure gradients that may be present.

19. When water molecules diffuse down the water concentration gradient and thus cross that membrane what occurs? Osmosis

20. Which tonicity is the one with fewer solutes? hypotonic

21. What tonicity has more solutes? hypertonic

22. This solution has the same amount of solutes. Isotonic

23. The amount of force preventing further increase in a solution’s volume? Osmotic pressure

24. What is it called when a vesicle moves to the cell surface, and the protein-studded lipid bilayer of its membrane fuses with the plasma membrane? Exocytosis

25. When a cell takes in substances near its surface it is? endocytosis

26. Phagocytosis is another word for..? Cell eating

27. Do Exocytosis, and endocytosis continually replace and withdraw patches of its plasma membrane? yes

28. Overall what does Exocytosis and endocytosis do? Move large packets of materials across a plasma membrane.